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https://issues.apache.org/jira/browse/QPID-7196?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15279077#comment-15279077
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Keith Wall commented on QPID-7196:
----------------------------------
Alex, can you review this commit please?
> [Java Broker] ConcurrentModificationException can occur on Broker startup
> when virtual host is activated
> --------------------------------------------------------------------------------------------------------
>
> Key: QPID-7196
> URL: https://issues.apache.org/jira/browse/QPID-7196
> Project: Qpid
> Issue Type: Bug
> Components: Java Broker
> Affects Versions: qpid-java-6.0.1, qpid-java-6.1
> Reporter: Alex Rudyy
> Assignee: Keith Wall
> Fix For: qpid-java-6.1
>
>
> ConcurrentModificationException is observed on broker start-up having 2
> virtual hosts with hundreds of queues. One host was DERBY VH and the other
> was BDB VH.
> {noformat}
> 2016-04-12 15:25:40,391 ERROR [VirtualHostNode-test-Config]
> (o.a.q.s.m.AbstractConfiguredObject) - Failed to open object with name
> 'test'. Object will be put into ERROR state.
> java.util.ConcurrentModificationException: null
> at java.util.Hashtable$Enumerator.next(Hashtable.java:1367)
> ~[na:1.8.0_66]
> at java.util.HashMap.putMapEntries(HashMap.java:511) ~[na:1.8.0_66]
> at java.util.HashMap.putAll(HashMap.java:784) ~[na:1.8.0_66]
> at
> org.apache.qpid.server.model.AbstractConfiguredObject.getContextKeys(AbstractConfiguredObject.java:2758)
> [classes/:na]
> at
> org.apache.qpid.server.store.berkeleydb.BDBUtils.getCacheMode(BDBUtils.java:161)
> ~[classes/:na]
> at
> org.apache.qpid.server.store.berkeleydb.StandardEnvironmentFacadeFactory$1.getCacheMode(StandardEnvironmentFacadeFactory.java:66)
> ~[classes/:na]
> at
> org.apache.qpid.server.store.berkeleydb.StandardEnvironmentFacade.<init>(StandardEnvironmentFacade.java:110)
> ~[classes/:na]
> at
> org.apache.qpid.server.store.berkeleydb.StandardEnvironmentFacadeFactory.createEnvironmentFacade(StandardEnvironmentFacadeFactory.java:82)
> ~[classes/:na]
> at
> org.apache.qpid.server.store.berkeleydb.BDBMessageStore.openMessageStore(BDBMessageStore.java:80)
> ~[classes/:na]
> at
> org.apache.qpid.server.virtualhost.AbstractVirtualHost.onActivate(AbstractVirtualHost.java:1871)
> ~[classes/:na]
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> ~[na:1.8.0_66]
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
> ~[na:1.8.0_66]
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> ~[na:1.8.0_66]
> at java.lang.reflect.Method.invoke(Method.java:497) ~[na:1.8.0_66]
> at
> org.apache.qpid.server.model.AbstractConfiguredObject.attainState(AbstractConfiguredObject.java:1308)
> [classes/:na]
> at
> org.apache.qpid.server.model.AbstractConfiguredObject.attainState(AbstractConfiguredObject.java:1287)
> [classes/:na]
> at
> org.apache.qpid.server.model.AbstractConfiguredObject$8.onSuccess(AbstractConfiguredObject.java:908)
> [classes/:na]
> at
> org.apache.qpid.server.model.AbstractConfiguredObject$8.onSuccess(AbstractConfiguredObject.java:902)
> [classes/:na]
> at com.google.common.util.concurrent.Futures$6.run(Futures.java:1319)
> [guava-18.0.jar:na]
> at
> com.google.common.util.concurrent.MoreExecutors$DirectExecutor.execute(MoreExecutors.java:457)
> [guava-18.0.jar:na]
> at
> com.google.common.util.concurrent.ExecutionList.executeListener(ExecutionList.java:156)
> [guava-18.0.jar:na]
> at
> com.google.common.util.concurrent.ExecutionList.add(ExecutionList.java:101)
> [guava-18.0.jar:na]
> at
> com.google.common.util.concurrent.AbstractFuture.addListener(AbstractFuture.java:170)
> [guava-18.0.jar:na]
> at
> com.google.common.util.concurrent.Futures.addCallback(Futures.java:1322)
> [guava-18.0.jar:na]
> at
> com.google.common.util.concurrent.Futures.addCallback(Futures.java:1258)
> [guava-18.0.jar:na]
> at
> org.apache.qpid.server.model.AbstractConfiguredObject.doAttainState(AbstractConfiguredObject.java:901)
> [classes/:na]
> at
> org.apache.qpid.server.model.AbstractConfiguredObject.access$300(AbstractConfiguredObject.java:80)
> [classes/:na]
> at
> org.apache.qpid.server.model.AbstractConfiguredObject$1.execute(AbstractConfiguredObject.java:513)
> [classes/:na]
> at
> org.apache.qpid.server.model.AbstractConfiguredObject$1.execute(AbstractConfiguredObject.java:500)
> [classes/:na]
> at
> org.apache.qpid.server.model.AbstractConfiguredObject$2.execute(AbstractConfiguredObject.java:561)
> [classes/:na]
> at
> org.apache.qpid.server.model.AbstractConfiguredObject$2.execute(AbstractConfiguredObject.java:554)
> [classes/:na]
> at
> org.apache.qpid.server.configuration.updater.TaskExecutorImpl$TaskLoggingWrapper.execute(TaskExecutorImpl.java:270)
> [classes/:na]
> at
> org.apache.qpid.server.configuration.updater.TaskExecutorImpl$CallableWrapper$1.run(TaskExecutorImpl.java:342)
> [classes/:na]
> at java.security.AccessController.doPrivileged(Native Method)
> [na:1.8.0_66]
> at javax.security.auth.Subject.doAs(Subject.java:360) [na:1.8.0_66]
> at
> org.apache.qpid.server.configuration.updater.TaskExecutorImpl$CallableWrapper.call(TaskExecutorImpl.java:335)
> [classes/:na]
> at java.util.concurrent.FutureTask.run(FutureTask.java:266)
> [na:1.8.0_66]
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
> [na:1.8.0_66]
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> [na:1.8.0_66]
> at java.lang.Thread.run(Thread.java:745) [na:1.8.0_66]
> {noformat}
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